EPR and ferromagnetism in diluted magnetic semiconductor quantum wells

Abstract

Motivated by recent measurements of electron paramagnetic resonance (EPR) spectra in modulation-doped CdMnTe quantum wells, [F.J. Teran {\it et al.}, Phys. Rev. Lett. {\bf 91}, 077201 (2003)], we develop a theory of collective spin excitations in quasi-two-dimensional diluted magnetic semiconductors (DMSs). Our theory explains the anomalously large Knight shift found in these experiments as a consequence of collective coupling between Mn-ion local moments and itinerant-electron spins. We use this theory to discuss the physics of ferromagnetism in (II,Mn)VI quantum wells, and to speculate on the temperature at which it is likely to be observed in n-type modulation doped systems.

arXiv comment4 pages, 1 figure

References in corpus (11)

• Ferromagnetic semiconductors
• Theory of Diluted Magnetic Semiconductor Ferromagnetism
• Interlayer coupling in ferromagnetic semiconductor superlattices
• Light and electric field control of ferromagnetism in magnetic quantum structures
• Theory of Magnetic Properties and Spin-Wave Dispersion for Ferromagnetic (Ga,Mn)As
• Theory of Ferromagnetism in Diluted Magnetic Semiconductor Quantum Wells
• Monte Carlo Study of Ferromagnetism in (III,Mn)V Semiconductors
• Limits on the Curie temperature of (III,Mn)V ferromagnetic semiconductors
• Ferromagnetism in Diluted Magnetic Semiconductor Heterojunction Systems
• Collective character of spin excitations in a system of Mn${}^{2+}$ spins coupled to a two-dimensional electron gas
• Field Effect Magnetization Reversal in Ferromagnetic Semiconductor Quantum Wells

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• Bias voltage controlled magnetization switch in ferromagnetic semiconductor resonant tunneling diodes
• Spin waves in magnetic quantum wells with Coulomb interaction and $sd$ exchange coupling
• Spin-subband populations and spin polarization of quasi two-dimensional carriers under in-plane magnetic field
• Theory of spin waves in diluted-magnetic-semiconductor quantum wells
• Dynamical Corrections to Spin Wave Excitations in Quantum Wells due to Coulomb Interactions and Magnetic Ions
• Electron spin decoherence in diluted magnetic quantum wells
• Spin waves in diluted magnetic quantum wells
• Electric field effect on electron gas spins in two-dimensional magnets with strong spin-orbit coupling
• Nature of the Perpendicular-to-Parallel Spin Reorientation in a Mn-doped GaAs Quantum Well: Canting or Phase Separation?